keep track of a text file

In message <2b98f2f70709300956w5bf6b0das679279446d1962b0 at mail.gmail.com>, Jeff Laine wrote:
>> Just wonder about one catch: is it possible to keep track of any text file's
> contents in a real time?
> For example, I open ttyv1 and via some magic command :) I get my file's
> contents updating in real time if any modifications occured.
>> Any advices will be very much appreciated.
tail -f <filename>
man tail(1) for details
Cheers,
Nick.
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